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Finding the Fourth Proportional to 216,469.31, 324,734.45 and 66,721.67

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Solution

The fourth proportional to 216,469.31, 324,734.45 and 66,721.67 is: 100,091.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    216,469.31 : 324,734.45 = 66,721.67 : x
  2. Step 2: Convert to fraction form
    216,469.31/324,734.45 = 66,721.67/x
  3. Step 3: Cross multiply
    216,469.31x = 324,734.45 × 66,721.67
  4. Step 4: Simplify right side
    216,469.31x = 21,666,824,476.92
  5. Step 5: Solve for x
    x = 21,666,824,476.92/216,469.31
  6. Step 6: Final answer
    x = 100,091.90

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.